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Demi's treatment at the Houston clinic is costing thousands of dollars.

Mel said: "The anti-neoplaston therapy is $17,000 (£12,600). Another $5,000 (£3,700) was for a dual pump - a new one was $6,000 so we've saved $1,000 by going for a second-hand one. The extra medication on top comes to another $24,000 (£17,796).

"This is what it's going to cost us every 14 days. We need to come up with that money every two weeks and they want us to stay for six weeks."

The therapy and the pump were one-off payments, but the medication needs to be paid for every two weeks.

(Image: Mel Knight)

Demi has just had a plastic tube called a Hinkman line inserted to her heart and will be hooked up to a pump around the clock as part of the anti-neoplaston treatment.